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《Journal of Glaciology and Geocryology》 2012-05
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Monitoring the Tower Foundations in the Permafrost Regions along the Qinghai-Tibet DC Transmission Line from Qinghai Province to Tibetan Autonomous Region

YU Qi-hao1,WEN Zhi1,DING Yan-sheng2,WANG Guo-shang3, LI Guo-yu1,ZHANG Jian-ming1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.Construction Ministry,State Grid Corporation of China,Beijing 100031,China; 3.Economic Research Institute,Gansu Electric Power Corporation,Lanzhou Gansu 730050,China)  
Following the Qinghai-Tibet Highway and Qinghai-Tibet Railway,the Qinghai-Tibet DC Transmission Line Interconnection Project is major permafrost engineering,and it is also a new type of engineering structure in permafrost regions.In this paper,the differences between the Qinghai-Tibet DC Transmission Interconnection Project and other permafrost engineering were analyzed.Then,the establishment of the monitoring system around the tower foundation,the observation elements and preliminary observational results were discussed.Analyzing the observation in 2011 found that the monitoring system is able to recognize accurately the various characteristics of the tower foundations in permafrost regions,as well as the main factors that control the stability and the variation tendency of tower foundations.The preliminary results revealed that the base of the monitoring tower foundations froze within the year,the tower foundation was stationary overall.However,near several tower foundations the ground temperature and the depth of the permafrost table were increasing,and the settlement and deformation showed a rising trend.In view of the project having completed just about 1 year,the stability of the tower foundation under change yet,it is necessary to monitor the load effecting on the tower foundation more time.Further more,the freezing-thawing and hydrothermal processes of the backfill,together with the deformation of the tower foundation,needs to analyze and research combining with the monitoring data and the simulation calculation.
【Fund】: 国家自然科学基金创新群体项目(41121061);; 国家电网公司科技项目(SGJSJS(2010)935-936)资助
【CateGory Index】: P642.14
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